As season 5 begins, the cast turns over for a second time. Most cast members are replaced by considerably older actors. For example, Imelda Staunton is 18 years older than Olivia Colman, Dominic West is 21 years older than Josh O'Connor, and Jonathan Pryce is 27 years older than Tobias Menzies. However, in the role of Diana, Elizabeth Debicki is only 5 years older than her predecessor Emma Corrin.
For her role as Princess Diana commencing with season 5, actress Elizabeth Debicki was coached by choreographer and movement specialist, Polly Bennett, who helped her master every nuance of Diana's gazes, hand-waves, general mannerisms, and deportment. Bennett had earlier assisted Rami Malek inhabit Queen's Freddie Mercury for his Oscar-winning role in Bohemian Rhapsody (2018).
In this particular season, actress Elizabeth Debicki, almost 6'3", takes on the role of Princess Diana who, at 5'10" was significantly shorter than Debicki. In fact, Debicki noticeably towers over just about everybody in her scenes. The actress who played Princess Diana in the previous two seasons, Emma Corrin, was 2 inches shorter than the real Diana.
The yacht that Charles and Dianna use for their vacation in Italy is none other than Aristotelis Onassis' Christina.